What does this mean?
We could not find a sitemap.
A sitemap is a blueprint of your website that helps search engines find, crawl, and index all of your website’s content. Sitemaps also tell search engines which pages on your site are the most important.
What to do?
You can automatically fix this issue for Wordpress websites, by clicking on the "Autofix" button or talk to your website developer.
Adding a sitemap will significantly improve your SEO ranking.
Learn more, here: https://www.seeme-media.com/what-is-a-sitemap/